Could be. I followed this guide http://wiki.classicamiga.com/How_to_..._within_WinUAE to create a 1GB SFS partition on a 4GB drive. Problem is I enter a Max Transfer of 0x1fe00. But this setting is not retained. It defaults back to 0xfffffff. Just tried to enter 0x1fe00 but it won't stay

EDIT: I used HDInstTools V6.9 that is within 'MyFiles' on 'Classic WB' rather than the standard WB3.1 one. I entered 0x1fe00 as Max Transfer. Rebooted and Dopus now works! The Max Transfer setting was retained.